using System;
using System.Text;

using Org.BouncyCastle.Utilities;

namespace Org.BouncyCastle.Asn1.X509
{
	public class CrlDistPoint
		: Asn1Encodable
	{
		internal readonly Asn1Sequence seq;

		public static CrlDistPoint GetInstance(
			Asn1TaggedObject	obj,
			bool				explicitly)
		{
			return GetInstance(Asn1Sequence.GetInstance(obj, explicitly));
		}

		public static CrlDistPoint GetInstance(
			object obj)
		{
			if (obj is CrlDistPoint || obj == null)
			{
				return (CrlDistPoint) obj;
			}

			if (obj is Asn1Sequence)
			{
				return new CrlDistPoint((Asn1Sequence) obj);
			}

			throw new ArgumentException("unknown object in factory: " + obj.GetType().Name, "obj");
		}

		private CrlDistPoint(
			Asn1Sequence seq)
		{
			this.seq = seq;
		}

		public CrlDistPoint(
			DistributionPoint[] points)
		{
			seq = new DerSequence(points);
		}

		/**
		 * Return the distribution points making up the sequence.
		 *
		 * @return DistributionPoint[]
		 */
		public DistributionPoint[] GetDistributionPoints()
		{
			DistributionPoint[] dp = new DistributionPoint[seq.Count];

			for (int i = 0; i != seq.Count; ++i)
			{
				dp[i] = DistributionPoint.GetInstance(seq[i]);
			}

			return dp;
		}

		/**
		 * Produce an object suitable for an Asn1OutputStream.
		 * <pre>
		 * CrlDistPoint ::= Sequence SIZE {1..MAX} OF DistributionPoint
		 * </pre>
		 */
		public override Asn1Object ToAsn1Object()
		{
			return seq;
		}

		public override string ToString()
		{
			StringBuilder buf = new StringBuilder();
			string sep = Platform.NewLine;

			buf.Append("CRLDistPoint:");
			buf.Append(sep);
			DistributionPoint[] dp = GetDistributionPoints();
			for (int i = 0; i != dp.Length; i++)
			{
				buf.Append("    ");
				buf.Append(dp[i]);
				buf.Append(sep);
			}
			return buf.ToString();
		}
	}
}
